Large horizontal tubular kiln

Abstract

The invention relates to the technical field of transformation of large horizontal tubular kilns, in particular to a large horizontal tubular kiln. The large horizontal tubular kiln comprises a steelshell and a heat insulation layer which is constructed by high-strength light-weight insulation bricks. A vault structure formed by the heat insulation layer is attached to the inner wall of the steelshell, a wear layer made of corundum-mullite wear-proof and refractory plastic adheres to the heat insulation layer. Anchoring parts made of heat-resistant stainless steel is welded to the inner surface of the steel shell. One end of each anchoring part is welded to the inner wall of the shell, and the other end of each anchoring part penetrates through the heat insulation layer to stretch into the wear layer. The anchoring parts are used for fixing the heat insulation layer and the wear layer to the inner wall of the steel shell. According to the large horizontal tubular kiln, the anchoringparts are directly welded to the inner surface of the steel shell and penetrate through the heat insulation layer to directly stretch into the wear layer, and a wear-proof lining is firmly fixed to the steel shell, so that the heat insulation layer is further reinforced; and a complete composite structure with good heat insulation performance, wear resistance, alkali corrosion resistance and anti-seismic performance is formed, so that the overall using effect of the large horizontal tubular kiln is improved, and the service life of the large horizontal tubular kiln is prolonged.

Description

technical field [0001] The invention relates to the technical field of large-scale horizontal tubular kiln transformation, in particular to a large horizontal tubular kiln. Background technique [0002] In the large-scale dry-process cement production line, the tertiary air duct is an important device for waste heat and flue gas recovery. It is a large horizontal tubular kiln. Its main function is to send a large amount of high-temperature flue gas in the kiln hood back to the preheater and decompose it. The furnace system participates in the cement preheating and decomposition process reaction. During the use process, with the operation of the rotary kiln, vibrations of different degrees often occur, which have a great impact on the stability of the kiln lining. The original kiln lining was built with refractory bricks and calcium-silicon boards. The bricks on the upper part of the air intake pipe were often loose and fell off, causing local overheating and redness of the a...

AI Technical Summary

Problems solved by technology

[0002] In the large-scale dry-process cement production line, the tertiary air duct is an important device for waste heat and flue gas recovery. It is a large horizontal tubular kiln. Its main function is to send a large amount of high-temperature flue gas in the kiln hood back to the preheater and decompose it. The furnace system participates in the reaction of cement preheating and decomposition process. During the use process, with the operation of the rotary kiln, there are often different degrees of vibration, which has a great impact on the stability of the kiln lining.

The original kiln lining was built with refractory bricks and silicon-calcium boards. The bricks on the upper part of the air intake pipe were often loose and fell off, causing local overheating and redness of the air intake pipe, and the production was forced to stop for maintenance.

[0003] The main reasons for the above situation are the following four points: First, due to the influence of the top steel shell on the masonry of the horizontal tubular furnace lining vault, it is impossible to achieve a firm arch, and the support function of the vault cannot be effectively exerted, resulting in a decrease in the bearing capacity

[0004] Second, the horizontal tubular furnace lining is built with a vault, and the back cushion is made of light thermal insulation material, which has limited strength and cannot guarantee the support strength of its arch foot. In a vibrating environment, the lightweight thermal insulation material will recede due to external force. Cause the arch foot to be unstable, which in turn affects the stability of the vault, causing the vault to loosen and fall off

[0005] Third, the insulation material of the horizontal tubular furnace lining insulation layer is affected by the high temperature environment during operation, and there are different degrees of thermal shrinkage, which makes the inner ring working lining sink as a whole and the arch foot support point recoils greatly, resulting in the structural damage of the working layer , masonry cracks appear, and then the high-temperature flue gas seeps into the insulation layer and further burns the insulation material. This cycle causes the vault to collapse and fall off, and the furnace lining is damaged

[0006] Fourth, there are no hanging measures at the vault, and it is only supported by the vault. Once the vault becomes unstable, it will inevitably cause a large area of ​​the vault to collapse, which will further cause the shell of the three air ducts to turn red and cause the entire line to be shut down for maintenance

Images